CVE-2026-29646CRITICAL 9.8EPSS p28.2%
CVE-2026-29646CVE-2026-29646
Description
In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 0.36% probability of exploitation · percentile 28.2% · 2026-06-19T12:03:05Z |
| Published | 2026-04-20 |
| Last modified | 2026-04-21 |
Underlying weaknesses· 1
References
- https://docs.riscv.org/reference/isa/priv/hypervisor.html
- https://docs.riscv.org/reference/isa/priv/machine.html
- https://docs.riscv.org/reference/isa/priv/supervisor.html
- https://docs.riscv.org/reference/isa/unpriv/zicsr.html
- https://github.com/OpenXiangShan/NEMU/issues/951
- https://github.com/OpenXiangShan/NEMU/pull/938
- https://github.com/OpenXiangShan/NEMU/pull/938/commits/55295c46580456d8d5a9d5736e1fda924b8825ab
1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Privilege Defined With Unsafe Actionscwe-267 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.